text: /*
   * Copyright (c) 2015, Mellanox Technologies inc.  All rights reserved.
   *
   * This software is available to you under a choice of one of two
   * licenses.  You may choose to be licensed under the terms of the GNU
   * General Public License (GPL) Version 2, available from the file
   * COPYING in the main directory of this source tree, or the
   * OpenIB.org BSD license below:
   *
   *     Redistribution and use in source and binary forms, with or
   *     without modification, are permitted provided that the following
   *     conditions are met:
   *
   *      - Redistributions of source code must retain the above
   *        copyright notice, this list of conditions and the following
   *        disclaimer.
   *
   *      - Redistributions in binary form must reproduce the above
   *        copyright notice, this list of conditions and the following
   *        disclaimer in the documentation and/or other materials
   *        provided with the distribution.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
   * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
   * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
   * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
   * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
   * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
   * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   * SOFTWARE.
   */
  
  #include <linux/module.h>
  #include <linux/configfs.h>
  #include <rdma/ib_verbs.h>
  #include <rdma/rdma_cm.h>
  
  #include "core_priv.h"
  #include "cma_priv.h"
  
  struct cma_device;
  
  struct cma_dev_group;
  
  struct cma_dev_port_group {
  	unsigned int		port_num;
  	struct cma_dev_group	*cma_dev_group;
  	struct config_group	group;
  };
  
  struct cma_dev_group {
  	char				name[IB_DEVICE_NAME_MAX];
  	struct config_group		device_group;
  	struct config_group		ports_group;
  	struct cma_dev_port_group	*ports;
  };
  
  static struct cma_dev_port_group *to_dev_port_group(struct config_item *item)
  {
  	struct config_group *group;
  
  	if (!item)
  		return NULL;
  
  	group = container_of(item, struct config_group, cg_item);
  	return container_of(group, struct cma_dev_port_group, group);
  }
  
  static bool filter_by_name(struct ib_device *ib_dev, void *cookie)
  {
  	return !strcmp(dev_name(&ib_dev->dev), cookie);
  }
  
  static int cma_configfs_params_get(struct config_item *item,
  				   struct cma_device **pcma_dev,
  				   struct cma_dev_port_group **pgroup)
  {
  	struct cma_dev_port_group *group = to_dev_port_group(item);
  	struct cma_device *cma_dev;
  
  	if (!group)
  		return -ENODEV;
  
  	cma_dev = cma_enum_devices_by_ibdev(filter_by_name,
  					    group->cma_dev_group->name);
  	if (!cma_dev)
  		return -ENODEV;
  
  	*pcma_dev = cma_dev;
  	*pgroup = group;
  
  	return 0;
  }
  
  static void cma_configfs_params_put(struct cma_device *cma_dev)
  {
  	cma_dev_put(cma_dev);
  }
  
  static ssize_t default_roce_mode_show(struct config_item *item,
  				      char *buf)
  {
  	struct cma_device *cma_dev;
  	struct cma_dev_port_group *group;
  	int gid_type;
  	ssize_t ret;
  
  	ret = cma_configfs_params_get(item, &cma_dev, &group);
  	if (ret)
  		return ret;
  
  	gid_type = cma_get_default_gid_type(cma_dev, group->port_num);
  	cma_configfs_params_put(cma_dev);
  
  	if (gid_type < 0)
  		return gid_type;
  
  	return sprintf(buf, "%s\n", ib_cache_gid_type_str(gid_type));
  }
  
  static ssize_t default_roce_mode_store(struct config_item *item,
  				       const char *buf, size_t count)
  {
  	struct cma_device *cma_dev;
  	struct cma_dev_port_group *group;
  	int gid_type;
  	ssize_t ret;
  
  	ret = cma_configfs_params_get(item, &cma_dev, &group);
  	if (ret)
  		return ret;
  
  	gid_type = ib_cache_gid_parse_type_str(buf);
  	if (gid_type < 0) {
  		cma_configfs_params_put(cma_dev);
  		return -EINVAL;
  	}
  
  	ret = cma_set_default_gid_type(cma_dev, group->port_num, gid_type);
  
  	cma_configfs_params_put(cma_dev);
  
  	return !ret ? strnlen(buf, count) : ret;
  }
  
  CONFIGFS_ATTR(, default_roce_mode);
  
  static ssize_t default_roce_tos_show(struct config_item *item, char *buf)
  {
  	struct cma_device *cma_dev;
  	struct cma_dev_port_group *group;
  	ssize_t ret;
  	u8 tos;
  
  	ret = cma_configfs_params_get(item, &cma_dev, &group);
  	if (ret)
  		return ret;
  
  	tos = cma_get_default_roce_tos(cma_dev, group->port_num);
  	cma_configfs_params_put(cma_dev);
  
  	return sprintf(buf, "%u\n", tos);
  }
  
  static ssize_t default_roce_tos_store(struct config_item *item,
  				      const char *buf, size_t count)
  {
  	struct cma_device *cma_dev;
  	struct cma_dev_port_group *group;
  	ssize_t ret;
  	u8 tos;
  
  	ret = kstrtou8(buf, 0, &tos);
  	if (ret)
  		return ret;
  
  	ret = cma_configfs_params_get(item, &cma_dev, &group);
  	if (ret)
  		return ret;
  
  	ret = cma_set_default_roce_tos(cma_dev, group->port_num, tos);
  	cma_configfs_params_put(cma_dev);
  
  	return ret ? ret : strnlen(buf, count);
  }
  
  CONFIGFS_ATTR(, default_roce_tos);
  
  static struct configfs_attribute *cma_configfs_attributes[] = {
  	&attr_default_roce_mode,
  	&attr_default_roce_tos,
  	NULL,
  };
  
  static const struct config_item_type cma_port_group_type = {
  	.ct_attrs	= cma_configfs_attributes,
  	.ct_owner	= THIS_MODULE
  };
  
  static int make_cma_ports(struct cma_dev_group *cma_dev_group,
  			  struct cma_device *cma_dev)
  {
  	struct ib_device *ibdev;
  	unsigned int i;
  	unsigned int ports_num;
  	struct cma_dev_port_group *ports;
  	int err;
  
  	ibdev = cma_get_ib_dev(cma_dev);
  
  	if (!ibdev)
  		return -ENODEV;
  
  	ports_num = ibdev->phys_port_cnt;
  	ports = kcalloc(ports_num, sizeof(*cma_dev_group->ports),
  			GFP_KERNEL);
  
  	if (!ports) {
  		err = -ENOMEM;
  		goto free;
  	}
  
  	for (i = 0; i < ports_num; i++) {
  		char port_str[10];
  
  		ports[i].port_num = i + 1;
  		snprintf(port_str, sizeof(port_str), "%u", i + 1);
  		ports[i].cma_dev_group = cma_dev_group;
  		config_group_init_type_name(&ports[i].group,
  					    port_str,
  					    &cma_port_group_type);
  		configfs_add_default_group(&ports[i].group,
  				&cma_dev_group->ports_group);
  
  	}
  	cma_dev_group->ports = ports;
  
  	return 0;
  free:
  	kfree(ports);
  	cma_dev_group->ports = NULL;
  	return err;
  }
  
  static void release_cma_dev(struct config_item  *item)
  {
  	struct config_group *group = container_of(item, struct config_group,
  						  cg_item);
  	struct cma_dev_group *cma_dev_group = container_of(group,
  							   struct cma_dev_group,
  							   device_group);
  
  	kfree(cma_dev_group);
  };
  
  static void release_cma_ports_group(struct config_item  *item)
  {
  	struct config_group *group = container_of(item, struct config_group,
  						  cg_item);
  	struct cma_dev_group *cma_dev_group = container_of(group,
  							   struct cma_dev_group,
  							   ports_group);
  
  	kfree(cma_dev_group->ports);
  	cma_dev_group->ports = NULL;
  };
  
  static struct configfs_item_operations cma_ports_item_ops = {
  	.release = release_cma_ports_group
  };
  
  static const struct config_item_type cma_ports_group_type = {
  	.ct_item_ops	= &cma_ports_item_ops,
  	.ct_owner	= THIS_MODULE
  };
  
  static struct configfs_item_operations cma_device_item_ops = {
  	.release = release_cma_dev
  };
  
  static const struct config_item_type cma_device_group_type = {
  	.ct_item_ops	= &cma_device_item_ops,
  	.ct_owner	= THIS_MODULE
  };
  
  static struct config_group *make_cma_dev(struct config_group *group,
  					 const char *name)
  {
  	int err = -ENODEV;
  	struct cma_device *cma_dev = cma_enum_devices_by_ibdev(filter_by_name,
  							       (void *)name);
  	struct cma_dev_group *cma_dev_group = NULL;
  
  	if (!cma_dev)
  		goto fail;
  
  	cma_dev_group = kzalloc(sizeof(*cma_dev_group), GFP_KERNEL);
  
  	if (!cma_dev_group) {
  		err = -ENOMEM;
  		goto fail;
  	}
  
  	strlcpy(cma_dev_group->name, name, sizeof(cma_dev_group->name));
  
  	config_group_init_type_name(&cma_dev_group->ports_group, "ports",
  				    &cma_ports_group_type);
  
  	err = make_cma_ports(cma_dev_group, cma_dev);
  	if (err)
  		goto fail;
  
  	config_group_init_type_name(&cma_dev_group->device_group, name,
  				    &cma_device_group_type);
  	configfs_add_default_group(&cma_dev_group->ports_group,
  			&cma_dev_group->device_group);
  
  	cma_dev_put(cma_dev);
  	return &cma_dev_group->device_group;
  
  fail:
  	if (cma_dev)
  		cma_dev_put(cma_dev);
  	kfree(cma_dev_group);
  	return ERR_PTR(err);
  }
  
  static void drop_cma_dev(struct config_group *cgroup, struct config_item *item)
  {
  	struct config_group *group =
  		container_of(item, struct config_group, cg_item);
  	struct cma_dev_group *cma_dev_group =
  		container_of(group, struct cma_dev_group, device_group);
  
  	configfs_remove_default_groups(&cma_dev_group->ports_group);
  	configfs_remove_default_groups(&cma_dev_group->device_group);
  	config_item_put(item);
  }
  
  static struct configfs_group_operations cma_subsys_group_ops = {
  	.make_group	= make_cma_dev,
  	.drop_item	= drop_cma_dev,
  };
  
  static const struct config_item_type cma_subsys_type = {
  	.ct_group_ops	= &cma_subsys_group_ops,
  	.ct_owner	= THIS_MODULE,
  };
  
  static struct configfs_subsystem cma_subsys = {
  	.su_group	= {
  		.cg_item	= {
  			.ci_namebuf	= "rdma_cm",
  			.ci_type	= &cma_subsys_type,
  		},
  	},
  };
  
  int __init cma_configfs_init(void)
  {
  	int ret;
  
  	config_group_init(&cma_subsys.su_group);
  	mutex_init(&cma_subsys.su_mutex);
  	ret = configfs_register_subsystem(&cma_subsys);
  	if (ret)
  		mutex_destroy(&cma_subsys.su_mutex);
  	return ret;
  }
  
  void __exit cma_configfs_exit(void)
  {
  	configfs_unregister_subsystem(&cma_subsys);
  	mutex_destroy(&cma_subsys.su_mutex);
  }
  